The M3 diff should be stronger as its got bigger and beefier components. The question I raise is if it is more reliable as a diff on overall. The quaife in no way makes the OEM diff weaker or less reliable or stronger for that matter.
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08 E90 335i AT RB Turbos -NX Wet Kit - Chiplogic Flash or Procede V5- M3 Diff - AE Exhaust- Forge Dv's - Helix Intercooler - AR DP's - P3 Boost Gauge - Vishnu Meth- Stett Chargepipe and CAI
09 C63
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